Suction ventilator



June 1 1926. 1,586,658

y DAVIS SUCTEON VENTILATOR Filed May 2l. 1925 2 Sheets-Sheet l @Hof/Muga V June l 1926.

l. DAVIS SUCTION VENTTLATOR Filed May 2l, -1925 2 Sheets-Sheet 2 Smmloz Il i l Patented June 1,

i IRWIN Davis, orxlnxsvuna. Missoula; I n

sUcrIoN vanruuoa.

`Applicatimi filed May 21, 1925. Serial No. 31,907.

My inventionrelates to improvements in suction ventilators and has for its object to provide a simple and inexpensive, yet a highly advantageousl construction which is such as to cause air current-s to create an upward suction through the Ventilating pipe. y

With the foregoing inV View, the invention resides in novel subject matter hereinafter described and claimed. The description being supplemented by the accompanying drawing.

Fig. l is a side elevation of a ventilator constructed in accordance with my invention.

Fig. 2 is a top plan view.V

Fig. 3 is a vertical sectional view.

Fig. 4 is a horizontal section on line L-l of F i'g. 3.

In the drawings above briefly described, the numeral 1 designates a foul air discharge pipe adapted to communicate withk a foul air outlet from la building or chamber to be ventilated. A vertically disposed sheet metal wall 2 surrounds the upper portion of the pipe 1 and extends a considerable distance above and below the upper extremity of said piperthe extension being substantially equal in both directions from ythe' extremity to eliminate down draft. rlhe wall 2 is spaced from the pipe 1 in parallel relation thereto, to provide an unusually Iarge comparatively unobstructed free air space and a plurality of substantially radialy vanes .3 extend between 4the pipe and wall to divide the space into a plurality of vertical air ducts. While the upper ends of vanes 3 terminate about even with the upper end of pipe 1, the lower ends thereof, extend below the wall2 and are preferably bevelled ytoward the pipe, as indicated at 4, thereby providing meansA for trapping horizontal air currents and directing them upwardly between the pipe l and wall 2, so as to create a suction through the plpe. y

To form vanes 3, I, preferably bend a plurality of metal plates Linto a U-shaped form in horizontal section, as seen in Fig. 4, the central portions of said plates beinglsecured by rivets or the like at 5 to the pipe 1, while the edges of said plates, forming Vthe outer portions of vanes 3, are bent laterally outward as at 6, and are secured by bolts 7 yor other means, against the inner side of wall 2. The several plates thus provide for supporting the wallrupon the pipe PATENT OFFICE l l as well as dividing the space between said pipe and wall into vertical air ducts.

Within the upper portion of the wall 2 and spaced from' said wall is a substantially conical cap 8 which is preferably provided with a depending corrugated flange 9 around its lower end. Through forming the base. of the conical cap of only slightly greater diameter Lthan the pipe 1, no obstruction is formed to prevent Aupward passage of air.

This flange is spaced above pipe land is provided with 'circumferentiallyf spacedk notches 10, through which the inner endsof radial arms 11 extend, said ends being bent upwardly and secured to the lower side of cap' 8, asl indicated at 12. yThe outer ends of the arms 11 are downwardly bent as at 13, and lsecured by bolts or the like, 14, to the inner side of the wall 2. The upper end portion 15 of this wall is preferably inclined inwardly and corrugated as indicated at 16 and is disposed in substantially parallel relation with'the wall of cap 8 to effect a strong suction and to further render the ventilator weather-proof.

By providing a ventilator as shown, air currents in all directions will create an upward suction through pipe 1, and a device is provided which will be absolutely weather-proof, due to the height of the wall 2, extending above and below the upper terminal of the pipe 1 and the conical cap 8 located within the projecting upperend of said wall. h

Excellent results have been obtained from the details disclosed, and they are therefore preferably followed, but within the scope of the invention as claimed, numerous minor changes may be made.

I'claim: y n

A ventilator comprising a foul air vdischarge pipe, a continuous wall spaced 4outwardly from and concentric with said pipe, said wall extending` substantially equal distances 'above and below the upper end of said pipe and having an inwardly upwardly `inclined upper end, a substantially conical shaped cap spaced above the upper end of the pipe and having a depending annular flange at its lower end, the base of said cap being of greaterdiameter than the pipe, a series of ioo circumferentially spaced brackets connectattached to said wall, and portions of said ing the lower end of said cap and adjacent vanes being extended below the wall to 10 portions of the wall, a set of vanes extenddeflect air currents upwardly between the ing vertically between and rigidly connectdischarge pipe and said continuous wall.

ing the pipe and wall, said Vanes being sub- In testimony whereof I have hereunto stantially V-shaped in cross section and havaiiixed my signature.

ing their intermediate portions secured to the pipe and oppositely extending flanges IRWIN DAVIS. 

